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Initial and current and everything inbetween; limits and high balances. I doubt the lenders can see the cards' limit history. But if and when they do, I wouldn't worry about low limits, while on the other hand reductions often stem from being overextended.
Experian also shows this, but I haven't seen it on Equifax. I don't know if lenders can actually see it, or if it just shows it to us. Low limit cards(below 5000) have not hindered me from getting high approvals or approvals at all. American Express reduced a limit and no other lender questioned it or followed. The only lender I have read that will mention it as a reason for denial is American Express.